Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f1e5754ca7f98d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 21:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4435d553080a64808ebca68f16d6d114 SHA-1: 779b9415fcc5b9ace9eb775b8620a67eca9f8f08 SHA-256: 12f1e5754ca7f98da0b72503ed93eb74db8a4ee6bdb9e6a2463dd19d673c9bb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which are indicative of link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=floyd+vs+logan+live+stream PDF link annotation
    • http://tjjjsh.com/uploads/files/mevomejuvufevewijerab.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/18764373755.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/vasuzagu.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69363076764.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96927791816.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/romigupekugumivixa.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/27903445024.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/jenabafav.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/9951647656.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/talifovotowexetaposef.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140920b90a0c---82717562417.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vojula.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/takupitenupobepexamiwupe.pdfIn PDF document text
    • https://simorgh.it/uploads/file/85675696757.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/luwop.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358ae560158---35056471799.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613085240d473---xoxanalemoweb.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/55125493618.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/32578735762.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/19be5265d03764c0773e1e880686324b/30030005055.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/jakof.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/35077649744.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 17476 bytes
SHA-256: 96cea6d300d3d380f21931caf1b8d76fa56f131b7bc82087057437738e6675ab
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 10748 bytes
SHA-256: b3eba82fb9bd54c250d133783d1cacf6de74ad38ccd0c02225102da6ade8684c
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1